Thanks Gabi. You want to know where I keep this plant. In the moment I have in a room, probably it's around 20 degrees during winter with some heating on. I have kept it under lighting in a shelve but had to move it - the flower stalks were growing so tall that they hit the light bulbs. So I have moved it slighty to the side of the shelve. So it still gets some light.Sometimes I am away for the weekend, then it could be that the heat will go up a little bit by 2 or 3 degrees (if the sun shines) but not too much change altogether.